Steam-boiler.



no. 7|3,4s2. Patented Nov. Il, 1902.

L. LEwlcKl.

STEAM BOILEB.

(Application led Apr. 25, 1902.)

(No Model.)

W'nedeof- Z22/Len??? 'fw I @M Mg, ai, mf M# turna Sir-aras Partir Qualen.

LEONIDAS LEWICKI, OF DRESDEN, GERMANY.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 713,462, dated November 11, 1902.

Application filed April 25, 1902. Serial No. 104.599. (No model.)

T0 @ZZ whom t ntfty concern.:

'Be it known that I, LnoNIDAs LnwroKi, a subject of the King of Saxony, and a resident of Dresden, in the Kingdom of Saxony, German Empire, have invented a new and useful Improvement in Steam-Boilers, of which the following is a specification.

This invention relates to an improvement in steam-boilers, such as are known as twotire-tube steam-boilers, and it particularly relates to providing such a boiler with a superheater for the steam within one of the tiretubes, in combination with means for putting said superheater into or out of action at will.

Itis well known that the placing of a superheater within the brickwork lines of a steamboiler causes a considerable loss of economical effect, because the superheater requires a high temperature of the heating-gases, and consequently the brickwork surrounding the superheater Will conduct a considerable amount of heat to the outer atmosphere.

In locomotive -boilers superheaters have been provided partly within the fire-tube and partly within the smoke-box in order to make better use of the heating-gases than would be the case by arranging the superheater outside the boiler.

In order to combine a superheater with a' two-iire-tube steam-boiler in such manner that such superheater may be entirely set out of action and also that its working when in action may be controlled, I, according to my present invention, connect the two tire-tubes laterally at a certain distance from' their rear or outlet end by a tube or a chamber and place dampers in both fire-tubes at suitable places, and within one ot said tubes between the said connecting-chamber and the outlet end of said tube I place the superheater. I am thus enabled to direct the current of heat-L inggases either all the way through both firetubes, thereby allowing the heating-gases in that fire-tube provided with the superheater to pass through the latter, or I am enabled by suitably regulating the dampers to allow the currents in both nre-tubes to pass Wholly or partly through the superheater, or by changing the position of the dam pers to allow the two currents to escape through the firetube Which has no superheater, thereby rendering the superheater in the other tube inoperative.

My improvement is illustrated in the accompanying drawing,which represents a horizontal section of a two-fire-tube boiler.

l and 2 are the two fire-tubes which are connected laterally at a distance from their rear or outlet ends by the transverse chamber or passage d. Although I have represented this lateral connection as a chamber, it may consist of a tube connecting the two tiretubes l and 2 and forming communication between them. The fire-tube 1 is provided at a suitable place beyond the chamber dits outer end, for example-with the damper c. The nre-tube 2 is provided beyond the chamber d with a damper b. Between this damper Z) and the rear or outlet end of the fire-tube 2 the superheater a is arranged, consisting of any suitable arrangement of tubing or conduit-for example, the double coil represented-for the exposure of steam Within it to the effect of the heating-gases passing through the fire-tube 2. If both dampers b and c are open, the fire-gases which pass through the lire-tube 2 will pass through the superheater and heat the same, whereas the gases which pass through the tire-tube 1 will heat the latter only. If an increase of heat is intended to be communicated to the superheater without increasing the fire, the damper c in the fire-tube l is so regulated that by throttlin g an inferior amount of heating-gases passes through tube l', while the remainder of the gases'from tube l pass through the superheater. If by regulating the damper h in front of the superheater, so that the entrance into the latter is reduced, a part of the heating-gases of the tire-tube 2 will join the current in the tube l and all of the gases will escape together through the damper c. By fully opening the damper c and fully closing the damper b the superheater is entirely set out of action. Both currents of gases will now together through the rear part of the tube l. The damper b in the Vfire-tube 2 might be arranged at the rear end of said tube, so that it said damper b be closed and the damper c opened the superheater and the IOC tion, and zt damper in the other tube between its outlet and said communication, substantially as herein described.

In testimony that I claim the foregoing as myinvention I have signed my name, in presence of two witnesses, this 14th day of April,

part of the fire-tube surrounding it is not fully deprived of the influence of heatinggases.

vWhat I claim as my invention is- In a, steam-boiler having two firetubes, the combination With said tubes of a lateral cornmunicatiou between them at e distance from 1902. their Outlets, a superheater in one of said LEONIDAS LEVICKI. tubes between its outlet and said cominuni- Titnesses'z HERNANDO DE SOTO, PAUL ARRAS.

cation, a damper in the one tube between its contained snperheater and said communica- 

